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VRAM bandwidth and its big role in optimization

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Jan Mróz

Proposed by Jan Mróz

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Description

VRAM bandwidth and its big role in optimization is Jan Mróz's Procedural Pixels explainer on why memory throughput often dominates mobile and integrated GPUs. He defines VRAM, the memory bus, and which fixed-function and shader paths read or write heavy resources each frame.

The article compares theoretical full-screen overdraw budgets on desktop versus Quest-class hardware, shows how to spot texturing versus SM bottlenecks in Nsight, and lists levers such as texture resolution, mips, transparency, deferred targets, depth formats, resolution scaling, and postprocess chains. Intel GPA on integrated GPUs is suggested when phone profilers are unreliable.

Intermediate optimizers profiling Unity or custom engines should already read GPU traces. Comfort with bandwidth versus ALU language helps when prioritizing mobile work.

It is one free long post on proceduralpixels.com linking forward to the GPU profiling basics article for tool setup.

Mróz's bandwidth framing is widely shared when teams discover desktop shader wins do not transfer to phone GPUs.